Ok, I'm having some trouble in tuning the amount of memory for netmap.
I have been following the man page from FreeBSD
<https://www.freebsd.org/cgi/man.cgi?query=netmap&sektion=4#end> in other
to understand the values at /sys/modules/netmap/parameters for linux but
I'm having some trouble in understanding what each value actually means.
For the following values:
dev.netmap.ring_num: 200 -> Is this the number of rings in the Ring Buffer
Pool?
dev.netmap.ring_size: 36864 -> Is this value, the number of slots per ring?
I'm trying to keep the amount of memory used by netmap as low as 4MB - 8MB
since I'm going to use only up to 4 NICs and one TAP.
Thanks for the help!
On 30 December 2014 at 16:16, Luigi Rizzo <ri...@iet.unipi.it> wrote:
> you can #undefine WITH_VALE.
> But it is only 20K of code (and 150K of data structures, which you
> can further reduce by lowering NM_BRIDGS).
> The saving is probably not worth the effort.
>
> cheers
> luigi
>
> On Tue, Dec 30, 2014 at 5:08 PM, Carlos Ferreira <carlosmf...@gmail.com>
> wrote:
> > By the way, another question.
> > Is there a way to not compile the code regarding the VALE switch? I'm
> only
> > interested in using netmap with Tap Devices and NICs, so I was hoping to
> > save some memory.
> >
> > On 30 December 2014 at 15:47, Carlos Ferreira <carlosmf...@gmail.com>
> wrote:
> >>
> >> You mean netmap_mem2.c ? It was there where I found the
> NETMAP_BUF_MAX_NUM
> >> define.
> >>
> >>
> >>
> >> On 30 December 2014 at 15:43, Carlos Ferreira <carlosmf...@gmail.com>
> >> wrote:
> >>>
> >>> Ok thanks. I was hoping not having to recompile the module, but it's
> ok.
> >>> Thank you for the info!
> >>>
> >>>
> >>> On 30 December 2014 at 15:38, Luigi Rizzo <ri...@iet.unipi.it> wrote:
> >>>>
> >>>> you can reduce the amount of ram (buffers, mostly) by
> >>>> tweaking the values in netmap_mem2.c ::
> >>>> struct netmap_obj_params netmap_params[NETMAP_POOLS_NR] = {
> >>>> ...
> >>>> }
> >>>>
> >>>> or you can simply modify the constant
> >>>>
> >>>> netmap_mem2.h:#define NETMAP_BUF_MAX_NUM 20*4096*2
> >>>>
> >>>> to something smaller that suits an openwrt box
> >>>> (in which i am very interested, as I'd like to deploy one of these
> soon)
> >>>>
> >>>> cheers
> >>>> luigi
> >>>>
> >>>>
> >>>> On Tue, Dec 30, 2014 at 4:12 PM, Carlos Ferreira <
> carlosmf...@gmail.com>
> >>>> wrote:
> >>>> > Update:
> >>>> >
> >>>> > I noticed that the netmap module was still crashing, after changing
> >>>> > the
> >>>> > OpenWRT VM ram to 256MB. I now raised to 1GB and it no longer
> crashed.
> >>>> > The
> >>>> > netmap module is now consuming about 350MB of Ram, which for my
> >>>> > objectives
> >>>> > is just too much...
> >>>> >
> >>>> > On 30 December 2014 at 14:06, Carlos Ferreira <
> carlosmf...@gmail.com>
> >>>> > wrote:
> >>>> >
> >>>> >> To Luigi and to whom may be able to help
> >>>> >>
> >>>> >> Hello all.
> >>>> >>
> >>>> >> Is it possible to reduce the size of the memory buffer allocated by
> >>>> >> the
> >>>> >> netmap module?
> >>>> >> I'm asking this because I was implementing some testing code, using
> >>>> >> NICs
> >>>> >> and a Tap device in an OpenWRT VM with 64MB of RAM.
> >>>> >> Because of the small RAM amount, the nm_open crashed when the
> program
> >>>> >> tried to netmap the tap device, after I previously netmapped one
> NIC
> >>>> >> successfully.
> >>>> >> After the crash, I bumped the VM RAM to 256MB and the test program
> >>>> >> ran
> >>>> >> well, but not without me noticing that the VM RAM consumption was
> >>>> >> increased about 90 MB by netmap.
> >>>> >>
> >>>> >> Resuming, I want to know if there is a way to reduce the memory
> >>>> >> buffer
> >>>> >> allocation, without recompiling the netmap kernel module.
> >>>> >>
> >>>> >> Thank you for the attention.
> >>>> >>
> >>>> >> --
> >>>> >>
> >>>> >> Carlos Miguel Ferreira
> >>>> >> Researcher at Telecommunications Institute
> >>>> >> Aveiro - Portugal
> >>>> >> Work E-mail - c...@av.it.pt
> >>>> >> Skype & GTalk -> carlosmf...@gmail.com
> >>>> >> LinkedIn -> http://www.linkedin.com/in/carlosmferreira
> >>>> >>
> >>>> >
> >>>> >
> >>>> >
> >>>> > --
> >>>> >
> >>>> > Carlos Miguel Ferreira
> >>>> > Researcher at Telecommunications Institute
> >>>> > Aveiro - Portugal
> >>>> > Work E-mail - c...@av.it.pt
> >>>> > Skype & GTalk -> carlosmf...@gmail.com
> >>>> > LinkedIn -> http://www.linkedin.com/in/carlosmferreira
> >>>> > _______________________________________________
> >>>> > freebsd-net@freebsd.org mailing list
> >>>> > http://lists.freebsd.org/mailman/listinfo/freebsd-net
> >>>> > To unsubscribe, send any mail to "
> freebsd-net-unsubscr...@freebsd.org"
> >>>>
> >>>>
> >>>>
> >>>> --
> >>>>
> >>>>
> -----------------------------------------+-------------------------------
> >>>> Prof. Luigi RIZZO, ri...@iet.unipi.it . Dip. di Ing.
> dell'Informazione
> >>>> http://www.iet.unipi.it/~luigi/ . Universita` di Pisa
> >>>> TEL +39-050-2211611 . via Diotisalvi 2
> >>>> Mobile +39-338-6809875 . 56122 PISA (Italy)
> >>>>
> >>>>
> -----------------------------------------+-------------------------------
> >>>
> >>>
> >>>
> >>>
> >>> --
> >>>
> >>> Carlos Miguel Ferreira
> >>> Researcher at Telecommunications Institute
> >>> Aveiro - Portugal
> >>> Work E-mail - c...@av.it.pt
> >>> Skype & GTalk -> carlosmf...@gmail.com
> >>> LinkedIn -> http://www.linkedin.com/in/carlosmferreira
> >>
> >>
> >>
> >>
> >> --
> >>
> >> Carlos Miguel Ferreira
> >> Researcher at Telecommunications Institute
> >> Aveiro - Portugal
> >> Work E-mail - c...@av.it.pt
> >> Skype & GTalk -> carlosmf...@gmail.com
> >> LinkedIn -> http://www.linkedin.com/in/carlosmferreira
> >
> >
> >
> >
> > --
> >
> > Carlos Miguel Ferreira
> > Researcher at Telecommunications Institute
> > Aveiro - Portugal
> > Work E-mail - c...@av.it.pt
> > Skype & GTalk -> carlosmf...@gmail.com
> > LinkedIn -> http://www.linkedin.com/in/carlosmferreira
>
>
>
> --
> -----------------------------------------+-------------------------------
> Prof. Luigi RIZZO, ri...@iet.unipi.it . Dip. di Ing. dell'Informazione
> http://www.iet.unipi.it/~luigi/ . Universita` di Pisa
> TEL +39-050-2211611 . via Diotisalvi 2
> Mobile +39-338-6809875 . 56122 PISA (Italy)
> -----------------------------------------+-------------------------------
>
--
Carlos Miguel Ferreira
Researcher at Telecommunications Institute
Aveiro - Portugal
Work E-mail - c...@av.it.pt
Skype & GTalk -> carlosmf...@gmail.com
LinkedIn -> http://www.linkedin.com/in/carlosmferreira
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